Problem Statement
You have a rectangular puzzle. The puzzle consists of R rows by C columns of roughly-square puzzle pieces.
When the puzzle is solved, each piece has a specific place in the grid. We can label the rows of the puzzle using the first R uppercase English letters (top to bottom), and the columns of the puzzle by positive integers (left to right). The label of each puzzle piece is then produced by concatenating the label of its row and column.
For example, the top left piece is "A1", and in a puzzle with R=4 rows and C=14 columns the bottom right piece is "D14".
Your friend has been working on an app that can help assemble the puzzle. So far, she has implemented the part that can look at a puzzle piece and determine its label.
Sadly, after you tested her code on your puzzle, you realized that one of your puzzle pieces is missing.
You are given R, C, and the
Definition
- Class:
- MissingPuzzlePiece
- Method:
- identify
- Parameters:
- int, int, String[]
- Returns:
- String
- Method signature:
- String identify(int R, int C, String[] pieces)
- (be sure your method is public)
Constraints
- R will be between 1 and 20, inclusive.
- C will be between 1 and 20, inclusive.
- pieces will contain exactly R*C - 1 elements.
- All elements of pieces will be distinct.
- Each element of pieces will be a valid label of a puzzle piece in a R times C puzzle.
Examples
1
1
{}
Returns: "A1"
A really sad story: the only piece of your 1 by 1 puzzle is missing. Obviously, this is the "A1" piece.
3
3
{"A1", "B1", "C1", "C2", "C3", "B3", "A3", "A2"}
Returns: "B2"
The middle piece of a 3x3 puzzle is missing in this test case.
3
3
{"A1", "A2", "A3", "B1", "B3", "C1", "C2", "C3"}
Returns: "B2"
The same puzzle as in the previous example. The only difference is that the pieces that are not missing are presented in a different order.
1
12
{"A1", "A3", "A5", "A7", "A9", "A2", "A4", "A6", "A8", "A10", "A12"}
Returns: "A11"
This puzzle only has one row.
1
12
{"A1", "A3", "A5", "A7", "A9", "A2", "A4", "A6", "A8", "A10", "A11"}
Returns: "A12"
2
2
{"A1", "B1", "A2"}
Returns: "B2"
2
2
{"A1", "B1", "B2"}
Returns: "A2"
2
2
{"A2", "B1", "B2"}
Returns: "A1"
2
2
{"A1", "A2", "B2"}
Returns: "B1"
20
20
{"E17","B15","R8","A9","C19","P19","J1","A12","G18","J10","D15","E20","E18","R5","Q4","K8","L10","J12","T20","G1","F19","A19","L1","C5","T7","F1","N16","N7","M12","I20","J9","L17","T11","G10","H7","D6","I8","Q2","O16","O4","P20","P4","R9","D8","Q11","D3","I10","T12","O2","A18","O9","K16","T9","H13","C8","F18","F17","S8","J7","N12","B1","C7","S13","T6","F20","T17","E9","H3","I18","B17","M6","K19","D1","T10","R4","D12","I7","T19","D20","O18","E19","G6","S3","P12","Q13","A15","S11","P18","K14","L4","O15","T5","E4","H19","A6","H14","C4","Q12","F15","L8","F4","B9","D10","M15","P1","J6","P5","R17","G17","Q7","Q10","P10","F3","L5","S4","B11","M2","B2","J3","J20","D2","N15","J17","M14","H6","F12","N13","S6","L12","B4","N2","M9","C10","M13","R11","T3","F5","D11","J2","O20","K11","I17","G9","I1","H9","S18","T8","O5","Q17","D19","A10","R10","L14","L11","S14","E16","C17","H4","K3","M1","D7","A3","H20","R20","D18","H16","Q8","A20","D16","Q9","B18","K2","G8","G20","A8","S2","C12","N20","Q19","O11","I19","G3","K13","R14","F6","I13","O12","N9","O10","J11","L13","E7","B6","S5","H11","K10","B7","R15","T13","A14","E5","C11","A7","G7","J8","F7","M3","F13","F14","P11","F10","G14","G15","N11","N17","I16","J19","J14","N18","H1","O14","F11","I11","J5","T15","E3","K15","L19","O1","B16","H5","N14","C13","A11","B8","N5","I6","S9","Q6","E10","T1","I15","C18","I5","H2","D17","F8","M8","N19","R19","L2","P2","S16","S1","B5","R2","E6","S12","D14","C2","E15","G4","S20","E2","B14","S10","C16","Q3","S7","K6","A5","M4","K9","G5","O17","Q16","H8","B13","C20","M18","H18","S17","N1","T16","N6","Q18","C3","P9","A17","J4","Q15","R1","G11","P14","I12","M11","D9","B20","Q14","I3","F2","L3","I9","M20","N10","K4","C9","P7","S19","M5","Q5","E11","C15","O3","T14","K17","C6","S15","K7","N3","D4","J13","L15","M17","J18","T4","K1","O8","B19","D13","R3","A4","K5","P8","E12","R12","F16","B12","K12","M10","C1","R13","R18","P15","E14","B3","J15","E13","O7","P17","L18","Q1","R16","P3","P6","J16","R6","P13","A13","O6","I2","G16","N4","O13","M19","G2","K20","M16","I14","T2","E8","D5","H17","C14","H12","G13","P16","L6","N8","L16","K18","A16","A2","M7","O19","E1","B10","R7","I4","L7","L9","H15","Q20","L20","T18","H10","F9","G12","G19"}
Returns: "A1"
20
20
{"Q2","D1","R2","G1","N2","E11","B3","I13","R20","A12","C4","P16","Q10","B7","G16","S17","S5","S11","P4","K7","B16","C11","K19","I2","G2","L19","N16","F12","B8","E13","K12","S2","F10","H9","N13","R9","O17","B15","I14","F1","N3","J3","A14","Q9","C3","H1","G3","L15","P13","C14","S15","M18","O3","O16","H11","J15","A9","F15","A3","D6","S3","F6","Q14","B10","A15","C5","B14","H3","F16","M19","T2","K6","R14","L13","F4","D18","Q20","G20","D4","K14","S4","G17","F14","D13","T15","F5","D10","L4","H15","E16","M3","B13","G4","J4","R13","N4","A17","E14","I5","T9","F3","Q12","J20","J11","E18","I10","O7","B17","B18","Q16","A2","M4","A4","T6","D15","O20","L18","A5","C1","L3","B11","C8","K15","K9","P3","B19","N6","E4","N17","J7","H14","F11","S10","I20","T14","M14","Q3","B6","I15","N15","Q4","F2","A10","J8","M7","C2","C9","K17","E5","C6","N20","E8","H5","L11","K4","M10","Q13","I1","D8","I3","J2","H17","A8","A11","P6","N8","C7","S6","C15","L6","H8","E6","L7","M13","D5","O9","F13","M16","R16","G6","O1","Q11","J19","G11","F19","D7","M6","S8","L20","D9","M5","K5","R8","P2","D20","R12","A16","L14","G5","I18","T4","P1","T11","L5","R17","L2","P9","K16","R15","L8","S18","K18","I19","B5","B12","E17","E2","P18","L16","H4","R19","N1","T17","I12","I4","T13","C16","B4","M20","S14","R10","K20","O12","T5","F9","M15","O15","O10","N9","J18","O13","A6","T16","E19","M17","T1","G8","Q18","C12","R11","N7","H18","D11","L9","J17","R18","N10","H12","O8","O4","S7","R5","S13","P14","C20","I8","L10","H13","O5","B1","P7","G10","H10","F17","N14","J12","S1","D3","J5","G12","C18","K1","H2","F8","N5","D12","C10","G14","B20","P10","T20","I9","M2","B9","K8","E20","E9","S9","E10","J16","J9","Q17","G9","Q7","T12","I6","T19","R4","N18","F18","O11","T10","T8","R7","J6","Q5","E1","R6","N12","S19","G7","H6","T7","P20","E12","F7","C19","S16","I11","G13","G18","R3","I7","M8","K13","B2","P19","E3","J1","G15","A1","D17","O14","R1","I16","Q8","J10","A18","P5","C17","Q19","C13","K2","M1","D14","G19","N11","Q1","A19","J14","K3","H19","H16","O6","J13","I17","K10","S20","T18","L1","A7","E15","P12","L12","K11","H20","P11","L17","M12","Q15","M9","P17","H7","D19","D2","F20","D16","S12","Q6","O18","N19","P8","E7","A13","O19","P15","M11","T3","O2"}
Returns: "A20"
20
20
{"P8","M3","J15","F7","G19","B12","M8","F6","A6","G16","J6","A12","H5","T11","M1","P17","M17","J2","E8","F12","C4","B19","C18","A16","O15","I6","G2","M13","H8","P20","T15","N14","O19","D17","K13","I7","M18","E20","D10","I8","F16","O18","K2","B9","K19","M6","P2","B18","O16","B2","E2","C13","A11","C1","J8","D5","M12","L15","A15","Q17","M19","B17","R20","B10","F17","D13","C15","Q11","I20","I14","B4","P15","A8","J20","B1","D14","O17","E4","P18","P11","I9","J3","A3","R4","A18","C7","O10","H15","P19","S4","I10","Q9","F10","S5","D11","Q19","P10","B13","E18","N1","R1","B14","R11","K3","N3","L2","C2","B11","R2","D9","G4","D20","K15","L11","G9","L18","E9","J13","K16","N16","M15","R13","J19","S7","A19","T16","S10","K11","J7","N8","D1","O20","J12","R6","E16","T17","L12","M11","K8","Q14","P4","B20","D8","M4","G11","L17","O6","P3","E7","G15","L6","N2","R8","L5","I11","G20","F3","T9","N4","H11","L7","I3","R10","T10","J16","T19","T4","P1","I1","G13","O2","Q8","K10","G3","D16","H1","L20","N7","S18","D2","A1","C9","F1","C10","N20","O13","S12","T13","J11","A5","N5","L9","O5","O9","A10","M9","R3","H13","F19","S2","F9","K17","O1","G6","L4","K9","Q3","I16","C19","E1","H6","T2","O14","S20","A9","J18","C12","S9","I19","H2","M5","S3","P6","D3","Q20","I17","J5","Q15","C20","K14","G17","D7","E5","R19","T6","F8","E13","E6","K20","A4","D6","J4","N6","E19","T20","N9","M14","C14","C17","N10","Q4","I15","Q5","B8","R17","A17","R14","L19","Q13","R7","C5","R12","F14","F13","K1","D18","Q7","H7","C11","M7","H3","D19","I4","N15","E3","N19","O3","F4","S6","P5","E15","R16","N11","C16","F20","T5","O12","B5","F5","J9","H4","G14","M16","C3","I18","J1","T8","G5","S11","B15","Q2","F2","R9","N13","K4","I13","A13","Q10","T18","A2","R15","G8","P16","C6","D12","L3","Q12","D4","I12","I5","S17","G10","E14","N17","L8","K12","O7","N12","F15","N18","J17","J14","D15","K18","S16","O11","K5","P7","S8","B16","Q18","A20","H18","B7","P14","H10","H9","L16","S1","O4","S14","S13","L14","H12","G1","H17","M2","O8","B3","F18","H16","C8","Q1","T7","H14","Q16","K7","P13","I2","F11","B6","P9","S15","E11","E12","M20","K6","G7","Q6","J10","A7","L10","T12","M10","R18","G18","E10","L1","T14","T3","E17","H19","A14","L13","S19","R5","G12","H20","P12"}
Returns: "T1"
20
20
{"Q2","I2","P5","L20","A16","I7","N6","K1","K7","K6","J17","F17","P15","B17","I4","T8","D15","I17","B1","O10","P17","R14","F11","G1","E15","F3","D20","Q19","I19","S19","A6","C16","S5","K3","G15","G14","O5","E19","K4","E12","I10","Q14","H12","Q6","P2","Q13","R3","A1","G3","T7","N15","C3","L9","C17","G2","N18","I9","F16","Q18","K11","Q20","H2","M19","N12","S12","C4","A4","S2","D5","F10","N16","Q10","L1","H16","G19","B4","T12","K13","A7","O15","C5","O2","H14","I1","J8","S7","G6","A5","J20","R4","I8","C20","L6","P8","P16","Q16","B12","A14","N8","S14","T14","L12","K16","M9","I5","C9","R10","F14","K10","L17","K17","B6","O1","P20","E1","P6","E10","S1","L16","Q12","H5","N19","T15","J16","C18","B2","H13","O3","Q17","R6","A19","O16","M17","F2","G20","P13","F19","A8","O14","M16","L18","L10","I12","N2","E7","J4","N5","S13","E5","L5","K5","M15","S18","S6","H7","P18","L13","P4","L14","G11","N3","J7","P3","O9","A2","D9","J1","T4","B9","K12","C7","T1","C6","G16","C19","M4","K8","N10","B15","M3","M10","S9","P9","R16","J6","S15","D10","I18","P14","S16","K2","G7","T6","I6","D19","Q8","L3","M8","J15","M2","J5","T19","L8","I14","H10","F9","Q1","O17","R20","T9","M13","H15","E8","Q5","F20","G10","G18","M1","L2","T13","J12","O19","C1","O8","L7","N14","E16","Q3","A11","H6","D13","R2","H11","T2","I20","O11","H19","B16","S17","F13","G4","O7","D11","B10","A18","D1","R7","A12","M5","E3","R5","S10","S8","F5","H8","O18","T10","G8","L15","H1","G12","F4","I13","J14","L11","D18","D2","N11","N20","F7","I16","B19","C8","R12","O12","P19","A3","M6","K14","S4","T3","T16","R17","A13","E18","E4","N7","E14","G9","T17","B5","I15","L4","H18","H20","N9","B11","E11","P1","H17","B3","E17","G17","J3","P12","J2","Q11","P7","N1","T11","M18","G5","B18","Q15","O4","K15","E2","J19","B7","D12","F15","H3","Q4","D8","R19","E9","D3","A9","M7","O6","B13","C10","J18","R9","A15","F12","B20","C13","D7","C12","B14","E6","K18","C14","A10","J13","P10","E13","R8","I3","O13","K9","K20","S20","D6","T5","N13","R1","I11","S3","J11","H4","D16","T18","M20","D17","A20","E20","M11","C11","N17","R11","Q7","P11","H9","C15","N4","M14","F6","D14","O20","S11","F18","F1","J10","F8","R18","R13","C2","Q9","K19","A17","R15","M12","B8","L19","J9","G13","D4"}
Returns: "T20"
20
20
{"K20","T19","S3","P10","C20","M18","R4","J3","H13","A7","E17","P12","G17","M4","L6","K6","R11","P1","C8","I17","I12","B13","N12","E11","D10","P4","M9","H19","F11","O7","I5","P8","M20","E7","B16","D2","M5","L10","H2","T9","S4","F9","D9","A13","B15","S10","D6","T12","I20","P15","T16","T15","B1","I4","H1","D13","E5","G4","J7","N7","F12","G3","B19","B10","E10","C14","R16","N13","E13","A3","Q6","A5","E2","E12","I2","M19","M8","J5","N5","J4","A17","P16","J18","D17","E19","P11","O16","B20","N16","R10","D3","E18","Q8","J12","P13","B6","B8","K18","L12","F8","I8","F18","S2","H14","P20","B9","L20","H8","K2","R12","Q10","E4","K17","O15","Q4","K13","B18","F17","D12","J14","T4","S7","D5","E15","A4","O3","R19","Q2","L15","Q11","M13","E6","O13","T6","S20","E1","D14","J16","H11","Q16","F4","D18","K5","M11","E20","C4","T5","G16","H16","B4","I15","G1","D4","C1","G13","A2","R17","C18","H4","Q20","B3","N11","S8","K14","Q17","R18","G19","A12","A9","D20","C3","H10","C6","R3","N14","O12","Q15","K8","L1","Q3","I1","T3","C15","G6","C19","R6","T13","F20","G11","D11","O9","S1","Q5","A15","H18","L5","N9","S19","N20","S16","F5","T8","H3","L14","F3","M6","I10","J13","K3","H9","M14","K19","T2","L9","N4","O8","C2","C16","O4","L8","K9","R8","L13","H5","T14","J6","M3","S14","F14","A11","E14","P3","L2","S15","Q18","R9","P18","R5","R14","K1","G5","N18","L16","K7","N10","G20","B7","S11","C13","D15","O10","O11","S5","C17","M12","C7","K10","I3","O18","O14","A18","B17","C5","R7","Q12","J9","H15","C11","S13","H12","B11","M1","K11","Q9","T11","E3","J19","T20","M7","H7","G14","A1","L7","T7","S6","P7","L4","R13","H6","H20","D19","N17","D7","O2","T18","D16","P9","J2","G15","S9","S17","T1","R20","C12","A16","Q13","J17","G18","P17","G10","B14","F7","C10","T10","P6","O17","A19","L17","Q7","I18","S18","N19","O6","I13","O20","N3","B2","K4","A10","F16","N6","P2","I11","F1","G9","I6","A14","R15","F13","O19","J15","R1","M17","C9","F6","G7","M2","G8","Q1","H17","J1","B5","K12","M16","F19","N15","O5","Q14","N8","E9","L3","J11","I7","L19","O1","N1","S12","K15","A20","E8","P5","M15","L18","M10","L11","J8","I9","K16","P19","N2","P14","D8","D1","R2","B12","J20","G2","I14","E16","F2","T17","F15","I19","A6","J10","F10","Q19","I16","G12"}
Returns: "A8"
20
20
{"D10","G2","B18","A4","M7","J3","Q17","N2","I3","J6","F1","H2","G10","L11","L20","T12","B13","P1","N1","D9","L9","K12","M2","E3","T18","S20","M1","S4","K16","O16","P19","G15","S2","F5","J11","D2","K9","C19","R5","B19","N14","A3","M4","M18","M10","S3","B8","P15","F7","L10","N9","G1","R9","K14","E6","T17","J2","D15","H1","O1","D18","O7","F18","C15","C1","K8","P2","E1","I2","N16","H9","D19","Q5","E7","A20","I19","E5","Q16","H4","B15","Q9","K10","B3","Q12","P14","J17","B17","B5","A5","G12","T2","K11","F16","C5","F20","M11","N6","R19","N7","O2","Q10","T7","F17","D13","K7","C16","T13","L15","C20","K20","I14","Q6","F4","A6","M14","R2","G13","O11","A1","C8","A13","C9","N13","T10","I20","B16","G14","D4","R1","G4","G17","J20","F19","C10","L4","P13","P4","Q13","L6","H16","S5","D20","B6","O15","M19","S15","A16","E9","D7","O3","R13","J14","O13","G9","K2","F10","E8","S11","E14","J12","I13","J15","J9","T11","Q2","R3","R12","P20","K17","D16","B12","N12","N4","I16","N5","R15","O5","P16","Q19","S1","A10","E4","L5","Q3","Q8","S8","H13","A14","K3","R6","D8","E18","L2","R8","D6","H19","P3","E12","P10","C13","C7","S17","F2","R11","F9","P8","O6","J19","I4","G3","S9","T6","E11","M5","D3","B20","M9","S19","S18","P17","Q20","P6","G19","G11","F13","M13","C12","I17","I10","L14","B4","J8","Q18","N3","J16","T19","O9","Q7","M12","O8","S13","B9","R4","C6","R10","F8","I5","D11","Q15","L17","I18","E19","H6","G6","A7","I15","H10","R17","R14","H8","A18","H7","H3","E15","L18","K1","J7","T5","K15","E20","S16","M15","O10","H14","N8","Q4","D5","H18","B10","A17","D12","O18","N17","G20","N10","F3","K4","O20","I7","C11","I8","T1","C2","H17","Q1","F14","J4","G7","T3","R7","L7","I9","S10","H20","N11","J18","I12","L13","H12","G8","O12","M8","K13","H11","E2","J5","K18","I6","K6","O17","R20","F6","L16","Q11","T4","A15","L8","L19","A11","C17","M16","O19","P5","C4","I11","F12","F11","E16","M3","G16","O14","P18","N19","P7","M17","C3","A2","M6","T20","H15","D14","N18","A8","G5","N15","T15","N20","C14","B1","T14","P11","B7","R18","A9","A19","O4","S6","A12","S14","L3","L12","B11","T16","S7","H5","L1","Q14","J1","J10","E13","P12","B14","D17","B2","R16","K5","F15","E17","J13","I1","T9","S12","D1","C18","P9","K19","E10","G18","M20"}
Returns: "T8"
20
20
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Returns: "H1"
20
20
{"T4","I13","E18","D17","R10","L20","F12","M4","F7","E11","M10","K8","T6","H18","R20","G18","D14","R19","G3","S7","B10","E16","M11","I9","E6","L6","O7","B11","T20","F8","Q19","N6","P11","J16","P3","O17","R4","Q3","J12","P17","I1","R8","D5","A3","D1","G13","E15","F6","J4","Q1","F15","B8","N11","C11","O13","L5","I10","L14","L9","M1","C12","R17","J3","B15","K15","R14","O1","I4","E17","T14","S1","N8","D13","T8","T17","J18","G7","Q7","Q13","S9","F2","A7","S13","G1","Q5","I8","Q17","S2","O14","C17","E20","G2","H7","L1","R11","A16","N16","F20","N17","Q9","S3","S20","M20","G16","T19","S17","H3","Q15","H17","C16","G9","J1","J13","A5","H12","R3","J15","L4","K13","F1","F9","H14","B17","E8","N1","G14","K1","P18","D3","A18","F19","N12","G8","Q14","P2","D12","K7","A6","N9","F13","T13","Q10","I12","K19","T11","O2","P7","N5","H9","R12","C3","J11","P15","H19","P6","J17","N15","L13","T9","I11","H2","M16","S14","D4","L8","G6","I18","E7","G20","O18","B2","T12","D15","C6","A4","F16","N18","P14","M8","P8","L19","M6","D2","M7","N13","N3","S12","D16","O20","R9","J8","K5","E14","A14","T16","A8","D11","T18","B14","S19","Q8","H8","E5","A2","K20","G15","A9","C19","J9","O10","B13","C20","A20","K10","C8","M18","F11","Q12","Q4","J6","H15","D6","L7","I19","B20","D8","F14","B9","T2","C1","B5","D19","C18","R2","O15","F10","K9","E19","C2","R1","P10","B16","K14","Q11","N10","C14","S10","C5","D18","E10","E9","S11","G10","A15","D7","F4","P1","N19","P19","R15","M15","M9","O11","I20","Q20","H13","K18","S18","E1","I2","I16","F18","O12","A11","L2","S4","S6","P12","F5","L16","L15","I17","A12","E2","S8","S5","H4","B7","L11","B3","P16","H6","K2","N14","G5","A19","P9","D9","O19","E3","M13","M14","H10","B6","Q2","O6","R13","M2","P4","D10","L10","Q6","S16","C9","G19","K6","J10","B18","R16","O3","S15","R5","J14","R18","N20","Q16","M5","M3","O8","J19","P5","C10","C7","T15","M19","B4","I3","A10","I6","T3","O16","I5","R6","L12","L18","L17","J7","T10","G4","F17","T7","D20","P20","H5","O4","R7","G11","J20","K4","K11","M17","H16","K12","C13","B1","A17","T1","I15","B12","G12","A1","L3","I7","J2","O9","J5","M12","N2","E13","P13","O5","F3","A13","B19","C15","H11","T5","K17","K3","C4","K16","G17","E4","H1","Q18","N7","N4","E12","I14"}
Returns: "H20"
15
11
{"B8","G3","H11","I5","N7","N4","G11","N6","C10","M1","E6","J1","J11","G6","D2","K10","A9","B6","E2","I2","E10","A2","D6","A5","H7","F7","F9","K9","N3","J10","G8","N9","N5","F4","M3","J6","I1","K3","L5","O8","C7","C2","D9","H8","D11","J4","I11","K7","J8","H6","H5","E3","E9","B4","L9","K4","L4","A8","F1","K1","L6","B9","C8","B2","A7","A1","J3","F6","I10","F8","A6","L3","K2","B11","I7","M6","G1","N8","M7","J5","A3","E1","C9","D3","K11","N10","K5","L11","O7","N1","N2","C1","O3","E11","N11","J2","I8","E5","O4","A4","L8","A10","H1","D7","D4","C6","O1","H3","B5","G10","I9","G2","M9","O10","B10","F10","J7","I3","L2","H4","H2","H10","C3","L7","G4","F2","C5","I4","K8","B7","O9","G7","H9","C4","B1","K6","I6","M5","E8","O6","D1","G5","F3","M4","C11","M8","F5","M11","O2","J9","D5","L1","L10","O5","E7","M2","D8","D10","M10","O11","A11","B3","F11","E4"}
Returns: "G9"
17
19
{"I14","F8","E8","M5","H14","A16","A2","B1","M3","L17","I15","O8","F12","P10","K15","O19","K14","D3","H19","Q3","B17","D5","P3","A10","O1","I10","C8","K11","L3","O7","A3","F3","K7","N18","M10","E7","N12","G18","B6","K2","P4","A6","E19","D6","N13","L1","H13","H7","J13","C4","Q5","H4","D8","D13","D2","C9","F7","F14","J15","D19","E6","C1","P11","N6","A5","J3","G7","K5","L4","G15","C2","A11","C7","K13","F17","C14","C6","M4","E3","M11","I5","B18","Q11","P2","G16","K1","D16","G2","H18","B12","K3","M15","P5","Q7","Q2","Q9","E4","B16","L18","L7","D15","J4","G1","B4","K18","O16","N16","M19","J8","E9","L14","F9","I8","L13","M2","Q4","J2","J18","E5","J14","F13","H6","B8","Q14","E16","G8","G19","O6","P14","J17","L8","C16","N10","I6","A9","B5","I13","G3","H17","B9","N2","A1","J9","I2","E11","E10","E14","B15","B10","P17","P16","E1","C11","C10","Q8","J12","I19","A18","O9","I12","I1","F11","N11","H12","I11","M7","E13","K4","Q12","J1","N4","H16","L15","F10","H1","G10","N5","I4","P9","I9","N8","G12","P15","K16","J6","G9","H10","D12","E15","A4","F19","J10","E17","G6","F4","P1","O13","J7","H11","Q13","Q16","O11","P8","F1","A17","N7","C13","B2","Q19","O18","M1","Q1","G17","M9","C19","C18","Q18","A7","P19","B11","E2","M13","P6","L10","I3","A13","I7","M18","O12","N3","L9","G14","A19","F2","A15","C15","N19","O4","K17","K8","D4","D9","G5","M6","C17","G11","P18","M8","O3","K12","D11","H5","K19","D10","D14","I16","J19","O10","Q15","F6","L2","B14","P7","B13","G4","Q6","L6","F5","O17","L12","M16","A12","L11","J11","K10","D18","L19","C3","O5","C12","L5","E18","J5","B19","H8","L16","C5","M17","K6","Q10","B3","N15","I17","O2","F16","B7","M12","D7","E12","N14","N1","Q17","D1","H9","G13","O14","O15","N9","J16","A8","H3","M14","I18","P13","A14","F18","H15","H2","D17","P12","F15","N17"}
Returns: "K9"
18
16
{"B12","J9","K16","F12","A16","K6","D14","B8","J12","Q13","F10","M12","A14","O5","R10","F2","H9","M1","E5","Q11","F7","L9","E16","A1","L1","I5","A3","H14","A9","G15","Q10","M14","K12","I15","E11","B7","B15","E1","A15","N10","A8","E8","C10","A10","I7","P12","R4","J13","L14","O11","E13","P13","N9","I4","H7","P16","E2","K5","K7","P6","C16","A7","L2","I11","F11","O2","D16","L4","I13","F1","K8","B14","H16","B11","R9","P11","I10","I12","C11","O12","J1","O1","I6","H15","O4","F13","M10","N2","Q16","B3","A11","K9","K2","P10","P7","H5","L7","C1","B9","Q9","F16","C9","F14","L5","I14","P9","L10","O16","M16","D2","R5","B6","K15","O14","L3","G12","H3","E7","J11","O8","I8","H13","M8","R14","M13","L12","O13","Q3","L6","G7","C15","N5","J7","H8","F3","Q2","C13","R16","D7","D9","M7","K3","E9","C5","L13","A4","D4","F6","N16","D1","A6","K4","R6","G1","D15","N1","H2","C3","B10","D3","I16","P14","R11","P15","E10","P1","D5","P5","M11","D11","G4","K11","B2","G8","B1","E15","N11","A12","Q14","G11","G2","N6","O15","R7","R1","O6","Q12","G6","P8","N12","A5","O3","N3","G3","F4","H4","O9","A13","B5","M9","Q7","K13","I9","B16","C14","J16","R3","Q5","J8","N8","P2","O10","J14","Q4","N4","K1","C4","D10","M6","L15","C12","N14","J2","E3","I3","H6","O7","G13","J15","H1","M3","H11","R13","E4","F8","K10","G14","P4","L8","J5","C2","R15","M15","N13","N15","N7","F9","C8","D12","F5","K14","M4","R2","J3","Q15","A2","D6","E12","G5","E14","G9","M5","Q1","R8","C7","D8","I2","H12","Q6","D13","J6","Q8","R12","B4","C6","F15","P3","L11","J4","L16","E6","H10","J10","I1","G10","B13","G16"}
Returns: "M2"
16
20
{"K11","O10","L11","H4","O15","L1","M20","K1","I6","J17","K17","K14","C16","M5","G11","M18","A14","J2","F20","O20","F4","H15","E12","B10","C10","P10","F2","D18","N14","N5","H12","J13","J20","I3","C20","L19","H19","J12","M8","O7","F15","E11","M10","F12","D9","O3","J15","I4","O9","C14","B19","P6","K10","C5","J3","A10","O13","C18","L15","D17","B8","I8","O5","O11","K18","H5","B5","G14","B2","C9","L17","L7","K8","E20","O2","M9","B11","D16","L2","K16","F13","F18","M12","D1","B6","H6","E3","J6","H10","J4","P16","B3","P13","N9","K20","L9","A9","C17","B9","M14","A8","O16","L10","A18","N2","D19","P8","I7","E2","H1","M7","G16","B20","N18","J19","I13","E18","K15","F10","I17","K3","O6","G5","N15","H20","M6","G3","A13","I15","H17","I19","P19","I11","A19","M1","J5","L16","K6","M11","N7","G13","L12","G4","J11","C13","E1","J9","E17","G10","A3","P5","A15","M4","G9","H7","L20","J1","H14","J7","K9","B16","M19","E9","C15","F19","N3","N6","P17","P4","A7","E15","A5","O1","J10","G15","C1","H13","J14","E5","N10","E19","D15","L18","D8","J16","K5","P11","A11","I16","B13","H8","K4","F8","M15","A20","G18","G6","P9","O4","N13","H16","K2","C19","B18","P14","A6","D4","F9","F1","A2","C2","D3","E7","A1","D14","I18","N16","N19","I2","N17","E8","M13","F14","M3","C8","L13","J18","N8","L5","F7","G2","C3","L14","C6","G20","H18","B15","F3","P2","O8","F17","I1","D12","D2","P20","F5","H9","K19","C7","E14","C4","L3","F6","E6","L4","I20","B4","P18","M16","O18","E16","M17","B1","G19","D13","L6","D20","G1","F11","K7","F16","J8","D6","P3","N4","D5","D11","G12","G8","E13","O17","P1","A12","P12","G17","N20","O19","G7","L8","A16","M2","P7","C12","I5","B14","P15","O12","K12","B12","B17","I9","H11","E10","B7","C11","E4","I12","A17","H2","I14","K13","N1","O14","N11","D10","N12","H3","D7","I10"}
Returns: "A4"
10
14
{"G1","E1","J2","D7","E9","E8","H6","G5","J1","F9","G14","D5","I10","B2","B10","G2","H1","C13","F4","A8","E2","F8","C8","J11","E4","D6","E3","F13","H13","I14","G3","E13","B3","D11","C14","D14","A2","C5","B6","B5","C2","C6","I12","H7","A10","G6","D1","H10","F10","D12","H5","A3","E6","I5","F2","B4","A6","J13","C11","D2","I6","D3","C9","A7","J5","D9","G12","D4","C7","B9","B8","G4","I8","A11","H2","C12","E5","D13","I13","H4","G10","I4","E10","B12","H3","J7","J12","I11","E12","F3","I3","F11","H9","I2","E7","B11","G13","A9","C10","I9","J3","J8","G8","H11","B13","F6","J4","A5","A4","F1","B7","E14","H8","B14","F7","F5","A14","C1","D8","C3","C4","G9","A13","B1","I1","J6","J14","E11","D10","J10","A12","F14","I7","F12","J9","H14","A1","G7","G11"}
Returns: "H12"
18
10
{"I7","D6","R9","O9","F3","C2","J8","D5","G8","R8","C6","H6","F9","P9","J4","M8","H4","F1","J10","J6","K3","E9","O1","B9","L6","E1","N2","Q9","K5","Q2","A7","H9","M7","I9","K1","F4","D7","A9","M3","L8","D3","B8","N3","M4","P6","M5","B7","E6","A3","K6","K7","O6","D2","E8","C9","J7","P4","I6","O5","J9","H7","A6","M6","C1","H10","I10","C5","O2","I8","C7","P5","O10","E3","N1","Q1","N10","B6","L10","F5","I5","J1","A2","D4","H8","L2","G1","A1","M2","Q6","K9","D8","L3","E10","C10","O7","P10","E7","L5","P2","E5","F7","I1","D9","R4","P3","C8","Q5","P8","A10","G7","J3","P1","E4","I2","R2","J5","A5","R7","P7","N8","C4","Q7","K2","B10","H3","C3","L9","Q3","L1","G10","N9","R1","O4","E2","M9","G5","B5","O3","H1","M10","L7","D10","Q10","F8","I4","B1","A8","G6","G3","D1","F10","H5","F6","K8","Q4","N5","Q8","I3","O8","R10","H2","F2","J2","K4","R5","A4","N4","B4","B2","M1","R6","G4","N7","R3","N6","L4","G9","G2","B3"}
Returns: "K10"
16
13
{"H1","M12","J5","G11","G9","M3","I10","L3","D2","K13","A6","A10","J12","D9","I11","K9","D1","M5","E3","K5","D4","H13","G12","C4","J2","B5","J10","C6","C1","G5","O11","D6","P3","H5","K11","I9","P10","L9","K12","F3","B8","I8","J8","A8","D5","H11","E6","A3","D13","H7","O3","J6","H12","O7","E13","L10","P8","L8","F4","F7","M13","H8","H6","M4","E5","I7","J7","D11","I3","N5","N2","E9","G6","E8","E11","F9","O12","F12","N3","P1","G4","D7","L7","L11","A13","O8","N7","K4","G1","I4","O4","C12","D3","E1","M2","F11","F2","K2","M9","C8","G3","P6","M6","C2","N1","N13","C9","G13","O10","H2","B2","L6","A9","B13","M10","K1","L12","A1","L5","F6","F1","P4","B10","E12","L4","N4","B9","C3","E7","H4","O13","M1","O9","J9","A2","B4","F13","E2","P2","F5","G7","P7","C7","A5","O2","B12","P12","O1","G8","M11","P11","L1","N9","J4","F8","C10","M7","I13","B11","O6","I5","D12","B7","A11","N10","G2","N6","C11","K6","C5","M8","J13","P5","K10","J3","J11","P9","O5","H10","I6","L13","G10","D8","B3","D10","I2","I12","N8","B1","F10","E10","K8","K3","N11","E4","H3","A7","P13","C13","A4","K7","J1","N12","B6","L2","A12","I1"}
Returns: "H9"
18
15
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Returns: "O4"
10
18
{"G9","G12","C3","B5","I12","G10","I11","J2","C5","C11","I7","E6","H13","B18","I1","D14","E17","F10","J6","B14","H11","A9","H12","B15","D2","J1","A8","J15","E7","C9","D18","F3","D3","C15","A3","E10","G17","A18","J14","F18","H18","I14","I5","A5","J17","J10","H7","F13","C16","C1","C7","D12","B10","B9","B7","D16","C17","H5","E1","G18","E18","G11","H6","I3","I17","G16","D9","E5","D13","G7","F11","F15","J16","E2","D15","C10","C8","F17","F16","H14","A12","H15","A11","B8","F5","J5","B13","D10","I9","A13","D11","E3","D8","G6","E11","E12","A1","F4","B16","H3","F2","F14","G5","C18","G13","G14","G2","J18","B6","E8","I8","A10","H17","E9","D7","A16","H16","J8","C4","I4","I16","I6","D6","J4","I13","J12","H1","C2","H10","D5","I18","A15","B2","A2","F1","D1","I2","B3","H9","I10","G15","H2","E15","E4","E16","A7","J11","B1","E13","A14","J13","I15","D17","B12","A6","J9","F7","G3","C12","E14","G8","B4","F9","H4","J7","G1","H8","F6","C14","C13","A17","F8","B11","C6","J3","G4","A4","D4","B17"}
Returns: "F12"
19
15
{"O2","R12","I5","B6","J13","C9","K3","P8","K14","F6","F11","R7","P1","F7","B1","C4","D2","K12","O10","B9","D12","R1","G4","M1","D6","R9","C6","O12","K8","G9","G10","P6","G3","E11","F9","K2","F2","Q15","H11","A8","G12","Q8","A10","B11","L15","P2","O15","J10","K7","I3","G11","L3","F13","S4","A1","P9","S3","N15","R3","A11","Q14","L5","L14","N4","N5","E2","C14","K6","K13","P5","N13","S11","R8","I12","D11","B7","O3","D13","M7","E3","D1","P15","H12","N9","Q4","I6","C15","M2","O13","E14","M12","C12","I11","S10","N10","D3","I4","E4","M15","F1","P14","R15","Q10","R5","S15","O14","O4","H1","J8","G7","D14","E6","O8","A4","S9","R14","H2","L8","G8","D8","S5","I7","J2","O7","P10","M8","J11","J12","R2","Q3","O1","M6","S7","B5","J15","K5","Q11","J9","N12","B14","H10","P12","I15","M11","B12","K15","J3","G15","B2","Q13","S2","B10","E15","E13","N3","N1","J5","I1","K4","B15","G2","B13","E8","O9","I13","M10","S6","B8","H3","J4","L11","F14","E12","N7","K10","H9","A14","K9","C3","N8","O6","S8","M4","P3","N11","F8","R13","L10","D9","D5","Q6","E1","J14","A7","O5","M13","R6","A5","C7","S14","I2","C2","G13","L6","M14","B4","H15","L13","P11","F10","C10","D7","I9","P7","J6","J1","L1","H14","A2","F5","L7","H6","D4","A6","I10","G1","H13","S13","A13","Q2","D10","C13","K1","N6","K11","Q1","I8","E9","E10","Q12","H7","L4","R11","J7","A12","M9","B3","F3","M5","I14","H5","C1","P4","C5","S1","F12","S12","N14","M3","F4","Q7","C8","P13","N2","O11","Q5","A3","A9","R4","E5","Q9","A15","L2","H4","H8","C11","G14","E7","F15","D15","G5","G6","L12","L9"}
Returns: "R10"
13
13
{"B6","I1","C2","F10","E11","H5","M1","M11","K4","D3","L10","D7","J5","F12","L8","A3","F1","D8","C7","H10","C8","K12","G4","E4","G6","J12","E10","L2","C6","L11","I6","D4","H11","G12","G11","I13","J7","B13","D6","I11","C12","G7","I9","H9","K9","B10","J9","I4","D2","K1","A13","J13","F11","B3","F9","M10","C3","I7","D13","E7","L1","D10","F4","F8","J1","B2","C13","B12","K2","I2","C10","A5","L5","H6","C11","M2","G13","J6","A6","E9","M4","G2","A4","J8","L13","H12","M6","G5","I5","F2","K6","K5","L12","H4","D5","B8","F5","F13","E6","I3","B4","B9","J3","M3","G10","C4","C9","M7","H1","I8","A11","K8","M13","L7","D9","D12","A12","E5","D11","K7","L9","G1","M5","H2","C5","E1","G3","A10","A7","J2","D1","E8","L6","M8","A9","E12","K10","H8","J11","F6","I12","J4","C1","K11","I10","J10","E3","B7","B11","B5","B1","E13","K3","L3","G9","F7","L4","H3","A1","H13","M9","F3","G8","E2","A2","A8","H7","K13"}
Returns: "M12"
10
12
{"B3","C3","C12","I4","D3","F10","I3","B1","B12","D6","F3","C11","B9","J2","A7","J8","A5","J6","I8","F6","F11","H12","D1","B5","A2","J11","E10","A12","B2","E9","B10","I10","F5","B11","H11","J1","I1","J9","D9","I6","I2","J4","G9","A3","D5","F9","D11","G1","B8","C6","G12","E12","J3","F1","D4","E2","E1","F4","H2","A8","I5","C9","J5","G11","H7","E3","C7","B6","D2","C10","H1","A4","H8","H4","I9","H9","C8","J7","E4","G2","A10","F12","G8","C1","I11","H3","A11","G3","C2","E6","A1","C4","H5","E5","B4","E7","I7","H6","D8","J10","A9","F7","E8","G4","E11","G5","D10","B7","D12","G7","G6","H10","G10","D7","C5","A6","F8","J12","I12"}
Returns: "F2"
15
19
{"D18","O9","B17","F4","O1","H15","O8","G19","N5","A9","K14","J8","C17","B6","N8","C6","C4","N12","E18","I5","E9","O12","D9","E12","C2","L9","B2","A10","C9","F6","F16","F12","N9","M18","I19","G12","N11","I3","N14","J14","L8","B18","J17","L6","E2","N16","A17","C15","D6","H9","E15","B10","L14","H17","K4","M1","B7","J5","O3","I2","D11","O5","O10","I9","A13","E11","M12","M8","D8","A14","L19","O17","F14","A2","H12","C7","H3","D14","I6","D15","K2","H6","K9","I4","B12","C18","J11","B11","L17","G6","B16","D16","E16","O15","D7","O4","K5","A11","F18","C19","O14","I14","E6","I16","K18","D3","L11","F19","O6","E17","G9","N17","A3","L2","H18","A15","L3","H14","M4","K3","B9","K10","E13","F8","C5","M7","N10","M15","M3","N4","M6","K16","H4","M19","C16","H19","N7","M16","L5","G5","F13","H16","J12","K15","J3","D12","B13","G11","J16","A5","L13","A16","N15","J7","F1","J18","I11","K1","G13","G10","B4","C13","B1","O16","E5","L15","E8","C11","D19","G4","C1","M17","B19","B14","O13","K12","M10","A4","J2","D17","L16","K13","M2","K19","G3","M14","H11","A8","J4","D5","K8","E1","A18","D10","G2","D13","I8","E3","G14","J1","F5","I17","D2","E4","K11","N2","F9","L10","K7","M13","F15","M5","I1","C3","L1","I7","I10","I15","A1","B8","J6","I13","J10","A12","H2","G15","J13","F17","K17","A6","E19","M11","J9","O18","K6","F7","N13","N18","H13","D1","H1","B3","M9","H5","I12","L18","A7","I18","G16","F2","H8","N3","L4","O19","H7","O2","N19","C10","C14","G18","L7","G7","B5","F10","A19","L12","C12","E10","N1","D4","O7","J19","G8","E7","C8","O11","B15","G1","H10","E14","F3","F11","J15","N6"}
Returns: "G17"
18
14
{"J5","Q11","I14","L3","C10","D1","O3","P11","N10","A3","E13","R3","A13","J6","E12","H9","C13","N14","E5","H11","E8","A14","F6","K11","A6","J2","R6","E9","N13","D4","Q8","M9","J11","K4","E7","H6","N9","O2","I5","B12","I4","Q2","A9","Q10","C6","B4","L5","L7","E10","G5","C9","H5","R12","I12","N12","C5","D6","P12","D3","L14","A11","B8","R9","Q3","Q6","R14","J10","C3","D9","J9","P10","G4","D2","H2","J13","G10","I11","P3","G11","C1","K9","A10","H13","G13","Q12","A12","I2","P7","H10","A4","F1","O14","M13","C2","D10","F13","C7","F2","R11","O4","K12","H12","J12","F10","L1","A7","Q5","L6","G2","O5","K7","J1","F4","D7","H7","H14","Q14","L8","G14","K13","B5","B3","K5","O10","N4","N8","G3","L11","F11","I6","E3","G1","K3","K10","M1","M11","M5","G12","O11","R5","H1","B14","P4","M8","M14","I8","L9","D14","E4","D13","N2","M10","B10","Q9","E11","Q1","N11","O8","D12","P6","G6","A1","R7","N7","R13","G9","L13","K6","I7","M2","N1","Q13","B7","L4","D8","F7","M7","M6","K14","K2","H4","M12","C14","B13","F3","J3","O9","Q4","I3","C11","E1","F5","R2","K8","K1","B6","E6","R10","P5","J14","F9","H8","C8","M4","P9","P14","G7","Q7","G8","B9","F12","O7","J7","D5","L10","N3","F14","R4","O13","P13","H3","C4","L2","B11","L12","P2","N5","A8","P1","A5","N6","J8","I10","A2","I13","B2","I1","F8","I9","O12","C12","R1","E14","O6","M3","O1","E2","R8","J4","P8","B1"}
Returns: "D11"
13
15
{"C9","F10","G15","A12","F7","G4","E14","H7","J9","I11","A10","E15","I1","M6","M15","J7","M11","D9","B4","J13","D12","J5","M13","J2","D10","B13","B3","L10","D4","L11","L5","K9","C1","D5","C12","B8","M3","F11","C6","I15","H12","H2","I8","L15","L14","J4","C10","F6","G9","I2","D15","F9","B11","K14","F3","A13","H5","L4","A11","H14","M2","D7","F8","K10","H4","A7","H10","F13","K4","F15","M7","J12","F1","L7","D3","A8","C14","H8","E10","E4","K15","B15","L12","J8","M5","I13","G2","J3","L2","L3","F5","E12","I14","G6","M4","M9","A14","G13","J1","K1","J11","A6","A15","H6","E7","H11","B9","B5","D6","C11","K8","D2","C15","M14","D13","L6","C7","H13","G12","M8","C13","A3","H9","B7","E9","K3","C4","L1","C2","J6","J10","I7","E8","F2","I4","D1","C3","G11","K5","B14","A2","L13","K12","B1","G3","G10","G8","H3","J15","H1","M1","E11","K11","A1","I5","E3","L8","B12","J14","D14","C8","K6","B10","B2","E1","M12","K13","G1","F12","G5","K7","I3","D11","E5","A5","L9","I6","C5","H15","A4","I12","G14","I9","M10","K2","F4","E6","A9","E13","F14","B6","I10","G7","E2"}
Returns: "D8"
11
16
{"B6","F11","H13","C5","D13","J8","A14","H9","F3","H7","H2","G16","C13","B4","E16","H1","K10","C10","C6","B12","I7","J13","J15","K3","B15","J2","I10","B8","K9","I9","D2","J14","B10","A6","G7","C2","E7","D15","K4","I4","J6","I13","F4","H8","D12","I15","D7","G2","B7","C15","H3","I6","G3","I11","D14","J5","F15","A3","E11","G10","D11","F10","F5","G15","B3","A16","A13","G14","A5","D5","K16","I5","B14","H12","G13","C8","I1","G5","G6","D4","K6","K8","A7","J7","J9","J3","E5","D9","K11","E9","A8","G4","H5","A9","H14","E10","G9","F12","I12","C3","E14","E12","K13","D6","K12","G1","J16","I16","J1","C7","H10","A10","H6","D1","D8","J10","B2","D16","H11","A4","E6","K7","B11","A2","K14","A1","B5","C14","A11","F13","G12","B1","G11","B16","F1","C9","G8","C4","E4","I2","D3","C12","I8","E2","D10","C16","A15","K1","I14","C1","J4","B9","F8","K5","C11","E15","F9","E1","E13","A12","H15","K15","F7","H16","F14","K2","E8","F2","F16","I3","J11","B13","F6","E3","H4"}
Returns: "J12"
20
14
{"D6","N1","O9","Q14","B10","R8","J14","O10","A9","N2","E4","L1","G1","G7","R9","K11","A12","F8","F12","I4","T7","E8","A11","D2","G9","K4","A3","A14","E12","C3","G14","S5","M10","A1","A7","I11","Q13","G3","L10","F6","M4","T3","T8","A8","E6","C2","C1","Q3","H1","C4","L14","L4","Q6","T14","R14","H12","J12","S14","P10","N6","F13","K9","I1","A5","R1","J1","B3","H8","K10","T2","G6","I7","H6","H11","S4","E1","T10","G2","F10","R4","I3","E9","L3","I5","E10","T6","M13","C12","E14","M14","F2","F4","D12","O6","H14","K13","N8","J4","J13","P6","T13","Q1","P4","D4","T1","K8","Q9","R6","E7","A4","P3","H9","D7","M11","O8","C6","N7","F9","E13","F7","B2","J9","D9","S10","I14","H2","I12","F14","D3","I9","T12","E3","N5","M7","S11","C9","J3","L9","A13","I2","P2","I10","G4","B12","E5","Q8","I13","R5","L2","F1","S3","S13","J11","H10","J6","B14","J5","R13","K3","P11","P8","S12","D10","B4","G8","T5","C7","Q12","D14","N3","E11","R7","A6","Q11","O3","N14","L5","S9","R12","B5","B1","C13","J10","B6","M6","J7","O13","T4","S6","S1","M9","M12","K2","K5","Q7","D5","J8","C5","H4","F11","P12","G5","O4","L12","L7","B13","L6","N9","O2","F3","Q10","D8","B9","C10","P7","P1","B8","B7","L8","S2","N4","I6","P9","R3","C14","Q4","E2","Q5","K6","S7","R2","H5","H7","B11","M1","O7","P14","J2","M2","Q2","G10","G12","O11","O12","K1","O1","R10","A2","A10","I8","L11","C8","K12","D13","P13","D11","N13","F5","P5","T9","O5","K7","N11","N10","K14","G11","D1","L13","O14","H3","C11","M5","R11","S8","M8","G13","N12","M3","T11"}
Returns: "H13"
18
14
{"A3","B4","I6","E6","I3","D13","P1","K9","P8","I4","J3","A2","C14","D11","K1","H13","P13","H1","G3","P11","J7","D6","D8","Q9","E2","P14","A8","B8","P2","F10","B9","J6","B2","A7","H7","J5","A12","F14","D5","L13","N13","H8","L4","R9","R10","E4","Q14","I1","C1","H4","J8","C10","N1","H11","R6","O1","I8","D10","H9","N11","N2","Q10","A4","L6","B14","Q5","G13","B1","F3","E11","K2","E7","B11","F6","N12","Q13","O10","C9","O13","F7","P3","G10","L10","I7","B10","M6","G12","D14","G9","B5","M5","M13","I2","N3","O5","B13","E9","G6","C6","I9","Q7","O6","F13","B12","F9","M8","J14","F12","R2","B6","E12","J1","D4","Q2","R5","C3","H14","R7","J9","G4","O2","Q1","O4","D1","A9","J10","N7","R11","I13","R12","F1","K6","C8","A10","G2","R14","K13","K3","H2","J11","Q3","G11","G14","F11","P10","Q8","M11","K7","K14","O14","C7","G7","M2","Q11","C13","E1","R13","H3","R4","A1","Q4","F5","E13","P5","O3","L1","P6","H10","M10","O9","E10","M4","I11","N8","D12","D3","A5","L14","E3","D7","A14","L8","D9","Q6","C12","N10","C11","R1","P12","J13","E5","B3","P9","N4","K11","K8","H12","N5","B7","J4","N6","C5","H6","K12","K5","K10","L5","A11","P7","I5","N9","P4","H5","M7","O8","N14","G8","L7","R3","L11","L3","C4","M3","G5","C2","O11","I14","M9","I10","F8","J2","K4","G1","L12","A13","Q12","M1","I12","F4","O12","F2","J12","E8","M14","L2","R8","E14","A6","O7","M12","D2"}
Returns: "L9"
19
10
{"P6","H9","D10","R9","E6","M8","G7","J1","R8","N7","P1","A9","C6","E4","L6","F10","A4","B1","C2","J4","D7","P10","F4","S1","L8","A8","G9","I7","M7","K8","O4","H4","B3","J10","K7","S9","C8","M4","B4","L10","I1","J3","P7","K9","P2","Q7","S6","I9","N6","I6","C10","K1","N2","N4","Q9","D3","B10","F1","L5","E1","E10","B6","G4","A3","C7","A6","Q3","E8","S10","C1","S2","L4","S7","I8","H5","J5","H8","R1","M6","L2","B8","O1","N1","Q6","R3","M5","A5","F8","L1","G5","H3","C5","Q8","G3","K4","E3","K5","R5","E2","H6","L3","Q1","P9","J9","D4","N3","F9","N10","A2","P4","G10","R10","O2","F3","J6","L7","K6","F7","R7","S4","J2","F5","E7","O5","N5","D2","I4","L9","S3","G1","B5","R2","O8","H10","H2","C3","A1","R6","O7","A7","B9","M9","E5","M1","Q4","I3","J7","D9","K3","G6","K10","P8","D8","Q2","N8","C9","F6","I2","D6","P3","F2","I10","J8","G2","I5","H1","G8","N9","O6","B7","M2","O3","A10","O10","Q10","Q5","C4","H7","D5","D1","S5","S8","M10","O9","E9","R4","B2","M3","K2"}
Returns: "P5"
19
16
{"M2","H1","B10","O4","Q6","P14","A15","E3","G8","B2","G2","F11","B5","Q7","E12","M1","K6","B9","C1","O7","N1","Q8","I12","R16","I3","L2","C8","E6","K16","K5","H3","F16","K8","J3","N6","K10","J14","D14","N14","A16","R1","J12","H14","S3","Q13","S8","D11","H4","S12","D10","A2","F3","I5","P7","G12","G15","H6","C16","O11","O2","J2","I1","H9","J10","P11","E2","L14","L7","D15","F8","L11","A10","F9","J11","C6","Q9","A14","E9","G4","D7","G16","P5","P16","K4","H15","R12","Q14","N10","O14","I6","P15","B7","K3","F14","E8","D9","I7","F4","D16","Q10","M3","S9","N8","S13","F5","H8","P1","M16","N16","Q1","P6","H13","M11","C12","B3","G9","E5","O6","C15","N5","H16","S11","L12","M7","R2","K9","M6","E7","S16","C9","G10","O10","A5","L6","O12","M8","F6","R10","B13","L8","J7","C14","F15","G6","D13","Q5","P2","E11","P8","H2","A8","N9","E16","J1","O15","C13","K13","L9","D12","S14","M5","N12","M10","F1","O13","J16","A9","I14","K15","Q4","Q15","J9","K14","H7","Q2","I16","R11","B11","M12","P10","J6","O16","N7","G5","C4","K2","N13","G3","L13","J5","F10","E13","B6","K7","H11","C11","H10","Q11","E14","C5","B8","J4","M14","I2","B15","N2","R14","G11","A4","O8","D5","R3","P9","O1","H12","E4","B16","H5","N11","A13","L1","B14","A7","M4","L10","J8","I15","A1","I10","M13","Q12","G7","E15","R6","O3","N15","L16","L15","P13","S6","O9","L3","A12","A11","R7","C10","C7","D8","D2","K12","I11","S2","M15","G1","S4","F2","G13","D4","L5","B1","S10","B4","S5","I13","D1","F12","R9","E1","P3","R13","A3","Q3","I9","G14","R15","C2","R5","K11","N4","O5","C3","R8","E10","I4","J13","K1","A6","J15","M9","L4","D3","S7","F13","P4","S1","Q16","D6","S15","F7","R4","P12","N3","B12"}
Returns: "I8"
20
4
{"L1","E3","L3","R2","S3","E2","T4","Q4","J4","A1","Q2","R1","S4","B3","K2","S1","H2","N3","D4","I1","N4","K4","B1","N2","K3","G3","R4","N1","T1","C3","L2","P1","T2","S2","G1","D3","J2","C2","O2","P3","I4","F4","B2","Q3","D2","J3","G2","P4","C4","D1","F3","E1","A4","H3","I2","J1","K1","T3","O3","O1","E4","F1","R3","C1","M4","F2","I3","Q1","P2","A3","B4","H1","L4","O4","M2","A2","M3","H4","M1"}
Returns: "G4"
16
9
{"G2","M2","L3","I1","I7","N4","K4","K7","O9","F3","P4","E2","F8","K9","E1","M1","K2","E4","H2","M3","N8","L8","H6","O8","C1","A3","E7","M5","I8","J6","B7","N7","K1","P8","K5","K6","K8","F4","G7","F9","H8","M4","I9","B3","G9","D6","P2","N5","M9","M6","B9","L6","D1","J9","D8","C5","N1","H9","A7","P1","F1","E6","F5","E3","P7","P9","A8","G8","F6","D2","M7","I5","I2","J8","B1","N9","C4","I6","O1","P3","O4","L4","O2","N2","C2","F2","O7","B5","D7","F7","A2","O6","E5","C6","J7","A9","O3","D4","M8","G6","H7","P5","C9","J3","G3","L2","H3","P6","D3","B2","H5","B8","G1","I4","O5","A6","L5","B6","D9","L9","K3","J4","G5","G4","N3","B4","C7","A5","E9","D5","A1","C8","N6","J5","H1","L7","H4","I3","L1","J1","A4","C3","J2"}
Returns: "E8"
1
6
{"A3","A5","A6","A2","A4"}
Returns: "A1"
9
17
{"H10","B13","A1","B5","F7","F8","G1","H13","B14","E5","F14","D14","A12","C14","E7","G8","A14","A6","F3","I11","H15","C3","I8","C17","E17","D2","G4","B7","E4","A2","E11","A11","H8","H9","D12","B8","D7","B17","D16","A5","D3","H7","B1","C5","F9","D17","A4","C7","C11","H1","C13","H17","D5","G16","E1","F15","I7","E2","E12","G9","I9","I12","F5","A13","G5","I2","G13","C1","A17","B11","E8","C15","C9","F17","F16","E6","H4","I3","B10","G7","E14","D9","G17","C10","B12","G3","H2","D8","D10","B15","D6","H12","G12","G2","I10","F12","E9","C6","C2","D11","G10","I5","A8","B6","B9","C4","G15","A15","A3","F10","F4","F11","I6","H14","C8","H3","F1","I15","I13","G14","H5","I14","D13","I17","I1","E15","E16","H11","H6","E13","F13","D4","F2","H16","D1","E10","B16","C16","G6","A9","B4","F6","E3","D15","B3","B2","C12","A7","A16","I4","G11","A10"}
Returns: "I16"
14
12
{"H12","K9","D9","I8","M3","B5","B7","J5","N9","J2","D8","E11","H3","J9","M2","E1","A10","E4","F10","E3","B6","B11","K4","L10","M4","B12","B1","E9","N3","B3","L3","A9","N4","K12","M11","L5","I4","G7","C5","M10","M7","B4","D11","J7","H1","I6","F4","L9","C10","A2","G8","G2","N6","D4","D6","L8","E5","J12","G4","C12","I9","H8","H5","K6","H10","F9","C4","K10","C7","E7","N1","C8","N11","C6","B9","A5","J4","K8","N10","D10","M6","L11","I12","J3","F11","I3","C2","D1","A3","H4","G1","N7","H9","B10","C11","N5","G11","N8","H2","I10","E8","K5","H11","K7","J8","D5","A6","A4","F3","L6","E6","M5","M8","G12","F8","H6","A1","I11","L12","I7","A7","N12","D3","G9","A11","C1","F6","E2","H7","C3","F12","G10","J6","A12","E10","J1","B2","K11","J11","M9","N2","C9","L1","K3","M12","L2","G6","G5","J10","F2","G3","I2","L4","I5","D7","A8","D12","F1","F5","E12","B8","K1","L7","F7","K2","D2","I1"}
Returns: "M1"
20
9
{"M5","E1","N6","H5","B7","R6","G4","Q4","Q5","I9","L1","I1","P6","N9","F5","K2","P8","L8","E4","N8","J7","L9","M4","R8","O5","H1","A4","T4","H9","B6","A7","H2","S1","B3","T1","G6","H3","E9","I3","I2","K6","M8","M1","Q9","A6","L6","M2","J8","C9","I5","J1","H7","B9","Q1","P1","G2","T2","O9","K5","D1","K9","D7","B5","D8","J6","T3","G9","B8","F3","D9","C2","P9","T5","R7","F6","N5","F9","A1","T8","L7","F4","F2","S4","L3","D3","O3","L4","N3","E6","Q3","F8","B4","T6","R4","Q2","H4","E2","N7","B1","G3","R3","I4","P3","M7","M6","N4","S7","S9","C1","N1","G7","K4","R9","P5","A2","S2","L5","D6","P7","C7","R5","J5","A3","C6","L2","D5","C4","J9","F7","I8","I7","M9","G1","T7","O8","O6","E5","R2","J3","R1","D4","Q7","A9","J2","Q6","S6","H6","E7","F1","S5","K1","I6","K7","S8","C3","K8","P4","K3","A5","G5","N2","Q8","O2","O1","O7","A8","O4","C5","E3","H8","G8","C8","D2","P2","M3","E8","B2","S3","J4"}
Returns: "T9"
16
11
{"L5","P7","O10","O6","A6","P10","L7","J1","C11","K5","C9","G11","O5","L6","O9","N9","G7","M3","H9","B4","N3","O3","N10","M11","H8","D10","F4","A8","M5","B9","C4","P2","I7","K8","O4","G3","L10","K4","B5","M1","O7","C2","N5","G6","G4","I8","K10","B2","N7","I1","I4","N6","F10","P8","B3","B7","F9","F2","I9","I6","N1","M8","F1","L11","E1","C7","E11","J4","I11","O2","H7","N11","J9","C5","C6","J10","P11","C10","A5","H6","F3","F6","I10","C1","E6","K6","D11","E4","M2","J3","P9","G2","E7","N2","H3","J8","B6","D1","I2","M7","D9","J7","L4","H2","B1","E2","M4","K9","A4","L8","G10","O8","J11","D3","F7","P5","D2","K11","F5","G8","C3","M6","D5","A11","I3","L1","K1","P6","P1","B11","J6","A7","G9","D4","O1","E10","E9","N4","K2","G1","O11","L2","E8","A9","K7","I5","E5","L9","J5","G5","L3","N8","E3","D8","J2","A2","F11","H11","M10","M9","P3","F8","B8","C8","D6","D7","H1","H10","P4","K3","H4","A1","A3","B10","H5"}
Returns: "A10"
8
7
{"E4","G6","A4","G7","C1","B3","G4","B4","G3","H4","B2","E2","H7","G1","E3","F7","C5","F3","A5","H3","H2","C3","E5","B6","G2","E1","E7","C7","A6","F5","H5","A7","D1","F2","A2","E6","A3","B5","B1","D2","B7","D5","C6","D3","D6","F6","D7","C4","D4","H6","C2","G5","A1","F1","H1"}
Returns: "F4"
6
6
{"B6","D3","A4","C5","A1","A3","C1","D5","E4","F5","B2","E5","B5","C4","B4","E1","B3","F3","E3","A6","F2","D1","D4","A2","C6","F4","D6","E6","F1","F6","C2","B1","C3","A5","E2"}
Returns: "D2"
5
4
{"E2","B1","B2","A1","C1","A3","E4","A4","D2","C2","D1","B4","D3","A2","E1","D4","E3","C3","C4"}
Returns: "B3"
17
13
{"M12","H7","M8","D6","M4","C1","D9","O2","O11","I5","H13","J5","N4","N11","K12","A1","Q1","M6","C10","I2","O5","L4","K6","L9","G13","A11","P13","J1","H10","B8","I11","K11","K10","K8","A12","J8","P7","E12","K9","C13","Q11","D2","I4","P2","A3","M5","N10","Q6","M7","Q9","G6","L7","C8","N9","M1","I3","H3","M11","Q7","Q10","H8","G9","B10","O8","B4","H5","O9","A7","E13","I1","K7","F13","B1","A9","G8","J2","I8","D1","F9","N13","L13","E8","N1","O3","I12","O1","C11","D8","F4","P5","O7","L2","B6","C5","N5","D11","H1","E2","L8","O12","N2","P4","F8","Q3","E5","C3","O4","Q4","F11","P9","G5","M9","N7","D12","E9","L1","G2","G12","J4","A8","M13","Q2","B11","C9","C6","B3","E3","N12","B9","B13","J9","A4","C12","F6","P8","P1","E6","B5","E10","D10","I10","H4","O13","L10","F7","P11","Q12","P12","J12","H2","J10","B12","K5","I9","B7","Q8","J11","A13","K4","F12","O6","M2","D4","L6","E4","F1","H11","P3","A5","L3","G4","L11","F10","Q5","D13","L12","Q13","G10","K13","F5","C7","J3","J7","I6","F2","L5","C2","K1","H9","C4","G7","A2","M10","E11","A6","I7","D7","M3","F3","B2","A10","D3","J6","G11","N8","P10","K3","N6","N3","G1","P6","O10","I13","G3","K2","E1","E7","H12","J13","H6"}
Returns: "D5"
15
1
{"A1","O1","G1","D1","E1","L1","B1","I1","H1","C1","M1","N1","J1","F1"}
Returns: "K1"
14
3
{"C2","C1","M3","J2","M2","H1","B1","I2","I1","G1","K3","M1","A2","F2","A1","K1","K2","E1","I3","D1","F3","H2","J1","E2","G2","G3","D2","J3","L3","E3","B3","B2","C3","N2","A3","N1","L1","D3","L2","N3","H3"}
Returns: "F1"
9
2
{"E1","A1","D2","D1","F1","H2","G1","A2","G2","B2","I1","B1","I2","E2","H1","C2","F2"}
Returns: "C1"
17
16
{"H4","G5","C6","C15","I13","F16","H10","L5","Q1","Q7","E10","H2","E5","C8","D12","C5","G9","E12","Q3","J6","P16","F9","Q4","I10","D13","A14","L13","G8","B11","A3","G7","K1","A1","L1","N10","I11","J4","A12","D2","A2","C9","A7","D11","N16","H12","K15","L12","P13","F10","K16","J1","Q10","M6","Q14","Q16","A9","C10","K5","B16","E2","P2","I15","A6","J13","K8","B12","I1","H11","N7","M2","F2","A8","L4","J16","O12","N15","J8","D10","C1","A5","D16","B14","N6","O10","K9","Q12","H1","A4","O6","O11","P1","G3","F7","E14","A11","K11","I3","Q5","I5","K12","M4","N5","L14","O13","N14","C12","B6","G2","N13","B9","L6","I6","N8","K14","K13","F11","M12","B3","H5","F4","Q15","C3","C14","G11","I16","G14","I7","M10","C16","F14","I9","B7","D1","B10","C7","K3","G6","E7","E4","G15","I14","O7","H7","O4","P12","G1","N9","P3","H3","N1","O5","D15","L9","Q13","H14","O8","L15","B5","N4","I12","J2","N12","Q8","A10","Q2","K7","B2","K4","P6","Q9","G10","B1","L10","K10","D8","M8","E8","H8","J9","M11","H16","O15","M1","P7","P11","L7","D14","N11","B13","O2","G12","M5","L11","J10","M16","J7","N3","E3","D6","F8","O3","E9","M13","F3","L8","P4","D9","K6","H15","B8","M9","Q6","F1","M3","J15","F15","E1","P10","O9","M7","I4","D5","F5","A16","J12","H9","P9","I8","B4","F12","C4","P15","O14","C11","M15","G4","P14","J3","C13","J5","H6","O1","P5","L16","N2","J14","H13","E16","D4","E13","I2","L3","E11","E15","Q11","J11","D3","B15","O16","E6","A13","K2","F6","F13","D7","A15","P8","L2","M14","C2","G13"}
Returns: "G16"
17
15
{"H15","I13","C11","K9","H4","F13","G9","F6","C4","G11","N4","C9","P3","C5","J9","N1","M10","G12","G5","G7","D3","Q1","M6","N10","G6","N3","F9","J11","K10","P14","B3","K14","L6","N9","A2","L13","I1","G15","I9","C7","C10","D5","O14","I7","B13","E15","K11","H1","D9","B1","B6","M14","P10","E4","D14","L14","D13","K6","A10","J3","N8","M11","M15","O10","J10","L2","G10","G2","F12","I14","F14","O12","I3","N5","B10","Q10","H14","N6","M8","Q6","P13","D7","Q5","O6","A13","A4","O2","I4","E13","I10","H3","G8","L12","E3","D15","N7","K8","P9","L4","B14","Q3","I15","A14","E5","A15","B5","B8","Q14","E11","F10","P4","H2","B15","F4","K1","C2","K2","C12","H5","I11","N15","H9","L10","M5","A3","K5","O9","P6","M13","Q7","B7","I5","B11","M4","D10","L11","A11","D6","L7","P1","M2","P5","J13","L8","H7","H13","J1","G3","C8","E14","E8","J6","O11","O15","Q9","K3","O8","K15","P7","C6","P8","N11","F11","F8","H8","E7","B9","M7","K7","D12","J12","D8","P2","F15","M12","I2","P15","C1","F2","E12","C14","J4","P12","K4","D1","K12","N13","A1","L15","J7","N12","D11","N2","P11","A8","H6","Q11","O4","E9","E10","H12","F3","N14","O5","B4","L9","A9","D4","J14","A7","H11","O3","E6","L5","G13","Q2","F1","G14","F5","C3","I12","B12","O13","M3","K13","H10","I8","B2","M9","Q13","Q15","J15","E2","Q12","E1","O7","G4","L3","F7","L1","A6","Q4","C15","C13","Q8","J2","M1","J5","G1","A5","J8","D2","I6","O1"}
Returns: "A12"
3
6
{"A6","A2","A1","B3","C3","C1","B2","A3","C6","B5","B4","B6","C5","C2","A4","B1","C4"}
Returns: "A5"
11
2
{"I2","C2","F1","B2","J2","C1","G2","D2","K1","K2","H1","I1","H2","G1","E2","E1","B1","A2","F2","D1","A1"}
Returns: "J1"
2
13
{"B9","A6","A5","A13","B7","A11","A9","B12","B4","B5","A2","B8","A3","A8","A7","B3","B10","B6","B13","A10","B2","B11","B1","A4","A12"}
Returns: "A1"
3
10
{"C1","B4","C8","A5","B10","B2","B1","C6","C7","A3","B3","A2","A7","B9","B6","A10","B7","A4","B8","C3","B5","A8","C2","C10","A6","C9","A1","C5","C4"}
Returns: "A9"
5
4
{"A4","D4","B1","A3","E1","C2","C4","E3","D3","C1","C3","A1","B4","B3","B2","D1","A2","D2","E4"}
Returns: "E2"
9
10
{"A9","F8","H5","B10","G1","B9","G6","G3","F1","H4","D7","F9","I1","G9","G2","C3","G4","F7","H7","E1","C4","E7","D8","C9","F6","H2","A1","D3","A3","B1","C8","A5","D1","H10","I2","D10","I3","G5","C5","C10","I9","E6","H6","C2","I6","B7","I7","G7","I8","B2","D9","E4","H9","G8","D2","E5","B4","D5","B3","H8","H1","F3","E8","H3","G10","E9","F5","E3","A2","F4","A6","C7","B6","B5","A8","C6","C1","D6","A10","F2","I5","I4","F10","A4","E2","I10","A7","B8","D4"}
Returns: "E10"
10
2
{"A1","G1","I2","B2","G2","J1","H1","I1","A2","D2","E2","D1","C2","H2","E1","C1","F2","B1","F1"}
Returns: "J2"
6
9
{"A8","A5","F2","E9","E4","B7","E5","F7","F8","D8","B3","F6","E7","D6","A6","D9","B1","B9","E8","D3","D1","F3","C5","E6","B5","F1","C4","B6","C1","D4","B4","C6","C7","B2","A9","E1","C3","A7","E3","D5","A3","A4","F4","C9","F5","C2","C8","A1","D7","D2","B8","E2","F9"}
Returns: "A2"
7
7
{"A1","G5","C6","G6","E6","A6","E3","F2","C2","A7","C5","C7","E5","B6","F7","B5","E4","D7","G1","D3","G4","C1","B4","F6","E2","F1","B7","F4","B3","D5","D1","D2","C4","B2","A5","F5","G2","D6","E1","G7","G3","F3","A3","A2","E7","A4","B1","D4"}
Returns: "C3"
10
8
{"A4","B6","H7","A6","A5","B4","I5","A3","I1","G2","F2","J8","H2","H6","E7","D4","J4","D8","A8","J2","E4","B5","J5","E6","A2","E2","H8","A7","D1","D2","C2","C1","F1","J7","B3","C5","I3","G8","F7","C6","G1","B1","B2","H4","I2","F5","D7","E8","A1","I8","C3","C4","G6","F3","H1","I4","C7","I6","J1","F6","H3","J6","G5","C8","G7","E3","F8","F4","H5","D3","E1","D6","G3","B7","I7","E5","G4","D5","B8"}
Returns: "J3"
2
9
{"A2","B2","A7","B8","B9","A3","A1","A6","B6","B3","A4","B7","A9","B5","A5","B4","B1"}
Returns: "A8"
8
1
{"F1","A1","C1","E1","B1","H1","D1"}
Returns: "G1"
5
8
{"D3","C2","C3","A2","C8","B2","A6","E7","A3","D6","C1","C5","A8","A5","E6","C4","B3","B8","E5","D8","B7","D2","B6","D7","D1","E8","E4","E3","D4","B4","B1","A1","C6","A7","A4","B5","D5","E1","C7"}
Returns: "E2"
4
6
{"C1","B1","C3","B6","D5","C6","A3","B4","C5","D6","D4","D1","A5","B2","A6","B5","B3","C4","A4","D3","D2","A2","A1"}
Returns: "C2"
1
9
{"A9","A2","A1","A6","A5","A7","A4","A3"}
Returns: "A8"
9
1
{"C1","B1","D1","G1","H1","E1","A1","F1"}
Returns: "I1"
1
10
{"A4","A9","A2","A3","A7","A10","A8","A5","A6"}
Returns: "A1"
6
1
{"B1","F1","C1","A1","E1"}
Returns: "D1"
3
1
{"A1","B1"}
Returns: "C1"
6
1
{"C1","A1","B1","E1","D1"}
Returns: "F1"
1
3
{"A1","A3"}
Returns: "A2"
7
1
{"F1","C1","E1","D1","A1","B1"}
Returns: "G1"
3
1
{"A1","C1"}
Returns: "B1"
1
7
{"A4","A1","A7","A5","A2","A3"}
Returns: "A6"